.banner{
    height: 500px;
}
.banner1{
    background: url("../img/banner.jpg");
    background-size: cover;
}
.banner2{
    background: url("../img/banner2.jpg");
    background-size: cover;
}
.banner3{
    background: url("../img/banner3.jpg");
    background-size: cover;
}

footer{
    background-color: #f5f5f5;
}

/*响应式*/
@media (max-width:600px) {
    .banner{
        height: 230px;
    }
}
body{
    background: url("../img/banner4.jpg");
}

/*网站的内容*/
.card .card-text{
    height: 30px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}


footer{
    background-color: #eeeeee;
    padding-top: 70px;
    padding-bottom: 70px;
    font-size:14px;
}

